Electric controlling system.



A. D. CARDWELL.

ELECTRIC CONTROLLING SYSTEM.

APPLICATION FILED SEPT. 5. 19m.

1,279,652. PatentedSept. 24,1918.

4 SHEETS-SHEET L.

A. D. CARDWELL.

' ELECTRIC conmonme SYSTEM.

APPLICATION FILED SEPT. 5. I914.

1 B79352. Patented Sept. 24, 1918.

4 SHEETS--SHEET 2.

A. D. CARDWELL.

ELECTRIC CONTROLLING SYSTEM.

APPLICATION FILED SEPT. 5. I914.

1,279,652. Patented Sept. 24, 1918.

Z6 g "I. W

A. D. CARDWELL.

ELECTRIC CONTROLLING SYSTEM.

APPLICATION FILED SEPT. 5. 1914.

I Patented Sept. 24, 1918.

4 SHEETS-SHEET 4.

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ALLEN D. CARDWELL, F BROOKLYN, NEW YORK.

ELECTRIC CONTROLLING SYSTEM.

Specification of Letters Patent.

Patented Sept. 24, 1918.

Application filed September 5, 1914. Serial No. 860,318.

To all whom it may concern Be it known that I, ALLEN D. CARDWELL,

' a citizen of the United States, and resident of 'New York city, borough of Brooklyn, in the county of Kings and State of New York, have lnventedcertain new and useful- Improvements in Electric. Controlling Systems, of which the following is a specification.

' This invention pertains to an improved system for transmitting from one point :or station to one or more points or stations electric signals designed to communicate intelligence of a desired character, such as, for

instance, for systems of printing telegraphs, utilizing substantially isochronous operation of two substantially similar elements at different points or stations, and whereby the operations may be effected at maximum speed with desired accuracy, and. so arranged that the system may be adapted for operation upon an ordinary Morse telegraph line and multiplex if, desired.

To attain this and other general. objects.

I have arranged my improved system with impulses which are started substantially with the starting a view to its operationb may be of the same direction, sent from the transmitting station and receivedat the receiving station, in such a manner as to cause isochronous operation of contact closing means at the transmitting and receiving stations. I

With a view to eliminating error by rea son of the failure of the impulse selecting or translating mechanism to operate isochlonously, I have 'provided means whereby the contacts at the receiving station are closed for a shorter time than those at the transmitting station, and" means whereby the time at which contact is made at the receiving station may be varied with respect to the-time at which contact is made at the will be apparent to the operator at the transmitting end of the line.

To these ends my invention, as set forth herein, provides for the use of a key board located at the transmitt ng ati n, whereta-cts at the sending end for the transmission of combinations of signals to the receiving translator. The receiving translator or translators may be controlled by a relay on the line that extends between the stations, or by whatever means of connection is utilized between, the stations, it being understood that this invention is not necessarily limited to use with a metallic line wire, and that wherever I refer herein to the line I mean such connection. between two or more stations or translators as is effective for the transmission of signals between them. The arrangements I have set forth are such that the receiving translator 'or translators is or of the transmitting translator and such translators then operate substantially isochthe transmitting station adapted to control the operation of printing or other mechanism at thetransmitting station as well as at the receiving or distant station to record, or acquaintthe operator with, the exact characters transmitted by him.

My invention is not limited to the specific embodiment of means, circuits, etc, herein set forth, nor to the use of the receiving translators with any particular recording or signal producing device, and the example of my invention illustrated in the accompanying drawings is not the'only form in which my invention may be carried out. My invention, as herein set forth, provides certain improvements in and modifications of the apparatus and circuits set forth in my application Serial No. 742,111, filed J an. 15, 1913, and features disclosed in my Said application are to some extent utilized in the mechamcal features hereln set forth, and as an example of my present invention as a modification over the said application, it may be I said that in the present invention 1 have provided means whereby signals may be communicated over an ordinary Morse telegraph line with facility and without departing from the usual method of operation of such line. Some of the features of my said application Serial No. 7 42,111 are illustrated herein in substantially similar manner, such as the keyboard mechanism and mechanism for rotating the 'cam shaft which controls the contacts, but in the present invention utilizing the action of the sliding bars for closing contacts for controlling the circuits of the contacts of the transmitting translator whereby signals may be communicated by impulses of but one direction as distinguished from impulses of different directions, as disclosed in my said application.

My invention further contemplates the production of contact making means which may be started and operated isochronously at the various stations from a normally inactive source of power, and which may be so arranged that the contact at the receiving station or stations may be made at any time and of any duration with respect to the time and duration of the corresponding contact at the transmitting station.

While my present invention may be used in connection with any suitable receiving apparatus to receive and record the signals transmitted from the transmitting station, it may be advantageously utilized in connection with certain of the features set forth in my application Serial No. 801,813, filed November 19, 1913, and with the printing mechanism set forth in my application Serial No. 20,386, filed April 10, 1915.

My invention comprises novel details of improvement and combinations of parts that will be. more fully hereinafter set forth and then pointed out in the claims.

Reference is to be had to the accompanying drawings forming part hereof, wherein,

Figure 1 is a diagrammatic view of an electric controlling system embodying my invention, adapted for use for telegraph typewriting purposes;

Fig. 2 is a detail perspective view of a portion of a keyboard and devices controlled thereby for selecting series or groups of impulses to be transmitted on th line;

Fig. 3 is a plan view of a cam shaft of the transmitting translating mechanism, for sending the impulses on the line;

Fig. 3 is a section of Fig. 3;

Fig. 4 is a similar view of the cam shaft of the receiving translating mechanism;

Fig. 4 is a section of Fig. 4;

Fig. 5 is an enlarged view illustrating a development of the toothed wheel of the cam shaft;

Fig. 6 is a diagrammatic illustration of the development of the cams of Fig. 3;

Fig. 7 is a similar view of the cams of Fig. 4.;

Fig. 8 is an end view of translating mechanism embodying my invention, part of the frame being in section;

Fig. 9 is across section substantially on the line 9, 9, in Fig. 10;

Fig. 10 is a plan of Fig.'8;

Fig. 11 is a detail view of parts shown in Fig. 8, in the operated position;

Fig. 12 is a detail view of part of the cam shaft operating mechanism, and

Fig. 13 is apartly sectional detail view of a portion of the receiving translating mechanism;

Similar numerals of reference indicate correspondingparts in the several views.

In carrying out my invention there is provided at one station means for selecting series or groups of impulses which are to be transmitted on the line by means of translating mechanism, which translates the combination of open and closed contacts into Series of impulses, continuing, in the example herein set forth, for a time equal to a series of six minimum impulses for a signal or operation. Such impulses are correspondin ly reproduced in receiving translating mechanism at one or more receiving stations, to record or utilize the particular combinations of impulses sent on the line at the transmitting station, for the production of definite or predetermined characters, signals or the like at the receiving station or stations. It will be understood that -impulses herein referred to may be considered as signals, and may be determined by any variation from the normal of the connecting medium between transmitting and receiving instruments or devices.

In Fig. 1 a transmitting station is indicated at A-and a receiving station is indicated at B, and the transmitting translating mechanism is represented diagrammatically at station A and the receiving translating mechanism is represented diagrammatically at station B, but it will be understood that similar sets of mechanism may be located at each station when desired, as will be more fully hereinafter explained. At the transmitting .or sending station (A) means are provided for closing the circuit at a plurality of contacts in the required manner to transmit the required series or groups of impulses for the signals sent on the line, and in the example illustrated five such contacts are provided as indicated at 1, 2, 3,4, 5, the contact 6 being adapted to cause the transmitting mechanism hereinafter described to start for sending the signals on the line.

' Said contacts are shown arranged in normally open pairs, adapted to be closed by bars 7, 7 that are suitably supported to slide inthe direction of the arrow 111 Fig. 2, and are provided with notches adapted to receive key levers 8, shown supported uponthe rod or shaft9, and adapted to be operated in the wellknown manner of a keyboard. The

bars 7, 7 are so arranged that one or more of them will be moved upon the depression of a key 8, and the movement of such bars, to close the corresponding contacts, will be in accordance with a predetermined or desired code or arrangement of signals. The bars 7 that are to be operated bya given key are shown provided with notches having in clined edges 7 beneath such key, and the bars beneath said key that are not to be operated thereby are shown provided with suitable notches o'r recesses 7 b which permit such key to be depressed without actuating the bar. By this means the notches 7, 7 of the bars can be so arranged that, upon the depression of any key 8, any one or more or noneof said bars will be moved (as inthe direction of the arrow in Fig. 2), to close 'corres 0nding contacts controlled thereby according to the pie-arrangedcode. Such key and bar arrangements are more or less similar to those disclosed in my said application Serial N0. 7 42,111. Other suitable devices may, if

preferred, be provided for causin operation of the contacts 1, 2, 3, 4, 5, 6, su stantially simultaneously for a given signal or series of impulses to be sent on the line. When a key has been depressed and the bars 7 corresponding to an appropriatesignal orgroup of .impulseshave been operated, said bars are to be retained, set until the corresponding impulses have been transmitted on the line, even thoughthe key;be released, Any suitable means for holding the bars in set positions may-be provided, and in Fig. 1 of the accompanying drawings the magnet Z is indicated and adapted to retain the operated bars 7, 7 in set position until the circuit is broken after eachseries or groups of impulses have been sent on the line, and to permit bars 7 to be restored to normal inactive positions, thereby to open the contacts 1, 2, 3, 4,

' closing the circuit at 6 for the purpose of starting the transmitting translator mechanism which is intended to send the impulses onthe line as set or controlled by the transverse bars 7. The transmitting translator is provided with the contact 6', adapted for startin each operation for a signal, and also with the contacts 1, 2, 3, 4, 5' for circuit at the corresponding contacts.

10, said contacts 1, l, 2,2,

being shown respectively connected together. The mechanism of the transmitting trans-.

lator (which ;is also substantially the Inechanism of the" receiving translator with the exceptions hereinafter noted), is shown in Figs. 8 to 13 in detail, and comprises a suitable frame 15, carrying" the contacts 1, 2, 3, 4, 5, 6, which are insulated therefrom, and other operating parts. In the construction illustrated, the contacts 1, 2', 3, 4L, 5, 6 are carried upon springsor the like 16, 17, supported on suitable insulation in the frame, and normally out of contact. At 18 are rocker arms or levers pivoted in the frame,.as upon a rod 19, having their free ends provided with insulation beneath the springs 17 to raise the latter to close 51318 means of suitable screws 20 carried by the frame, the position of the free ends of the arms or levers 18 with respect to the springs 17 may be adjusted. At 21 is a cam shaft rotatively supported by the frame and shown located below the rocker arms 18, and having a cam for each arm disposed in such position as to cause said arms to be raised and lowered in succession for each complete rotation of said shaft. The cam shaft 21 of the transmitting translator is shown in Fig. 3, and the cams thereof are so disposed and their operating faces so positioned, (in a spiral-like direction around the shaft), that as soon as said shaft starts to rotate, the cam face 21 (Figs. 3 and 10) will immediately cause the corresponding rocker arm 18 to rise to close the circuit for starting a given signal at the contact 6, and will cause the breaking of said contact just before the next adjacent cam face raises its correspond.- ing arm 18 to cause the contact to be closed at 1', and so on successively, making and breaking the circuits of the contacts 2', 3', 4, 5 successively, until one complete rotation of the cam shaft has been made. It may here be stated that as circuit is closed and opened successively at contacts 6, 1, 2, 3', 4', 5, for each rotation of the cam shaft, current will be transmitted to the contacts 1, 2, 3, 4, 5-? from any of the contacts 1, 2, 3, 4, 5, which may have been closed by the depression of a key 8 for a given signal, and-that no current will be sent on the line through the contacts 1, 2, 3, 4, 5, whose corresponding contacts '1. 2, 3, 4. 5, have not then'been closed. The cam shaft is rotated a complete rotation, step by step, each time akey 8 is depressed, and then comes to rest until another key is depressed or the same key is again depressed. The spaces-behind the cams are entered by the corresponding projections 18 (Figs. 9 and 13) of the rocker arms 18 to permit the contacts to break, and in the normal inactive position of the cam shaft the projection 18 of the contact 6' of the transmitting translator rests in such space. To rock theshaft 21, step by step, I provide an electro-magnet 22, suitably supported upon frame 15, and to the armature 22* of such magnet is connected a rock arm orlever '23 shown carrying two pawls 24,-"25' arranged in reverse relation with respectto a toothed wheel 26 secured upon shaft '21. A spring 27 connected with said pawls tends to keep them in contact with said toothed wheel. An adjustable stop 28 shown adapted to coact with pawl 25 to limit its upwardmovement causes the cam shaft to stop at the proper point each step by said pawl, and a stop'29 on arm 23 prevents overthrow of the shaft when operated by said pawl 24. A spring 30 shown connecting the armature 22 with frame 15 serves with ma et 22 to rock arm or lever 23. The cam s aft 21 also carries (shown at one extremity) a unison cam 31, the purpose of which is to insure a complete rotation of the cam shaft forv every key operation.

Magnet 22 is in a local circuit including normally closed contacts 32 shown carried by springs 33, 34, supported upon suitable insulation on the frame. Magnet Z is connected to ground and to sprin 34, Fig. 1. The arm or lever 23 carries a stud 35 which is shown projecting through a hole 36 in. framev 15, the stud on the first depression of arm or lever 23 depressingl a contact lever or arm 37 suitably supporte upon the frame as at 38, and carrying insulation 39 adapted to operate upon spring 34 to break the circuit at contact 32, as shown in Fig.11, to open the local circuit of the'translator magnet 22. .Contact'lever 37 is retained in its downward position by a latch pawl 40 that is pivotally supported as at 41 upon an adjustable plate or arm 41 that is pivoted at 41 upon frame 15, and adapted to be adjusted" angularly around said pivot to vary the time of engagement of stud 42 with latch 40. Said plate or arm 41 is shown provided with a slot receiying a screw 41 from frame 15 to retain said plate or arm in 'set positions. Latch 40 is normally controlled by a spring and said latch has a stop portion 40" adapted to engage the projecting portion 37pf contact lever 37 to retain the. local circuit zof' the: magnet broken ,until the armature and its arm 23 have been restored nearl to normal, and thereupon the stop or stu 42 on arm.23 en-' gages the project ng arm of latch 40 to release arm 37 to permit contacts 32 to again close each time magnet 22 is deenergized.

ground 53 through switch 72'.

.48 that is connected with one winding of a relay 49, (Fig. 1), whereby the workin' 'circuit of magnet 22 will be maintaine unbroken at 48 during each complete rotation of shaft 21 when shaft 21 commences to rc; tate for each group or series of signals sent. When contact 48 is closed it retains closed the circuit of the magnet Z, until the cam shaft has made a complete rotation, inasmuch as magnet Z is energized through the said contact 48. When shaft 21 makes a, complete rotation and the unison cam 31 operates tooth 45tocause contact 47 to break circuit, the magnet Z is deenergized to permit the o erated bars 7, 7 to return to normal, and a so the magnet 22 is deenergized until again operated by reason of the depression of a key.

The receiving translator at a receiving station is substantlally similar in construction to the transmittin translator above described, (as'before noted) the receiving translator the contact 6' and its operating parts are omitted, and contacts designated 1, 2", 3", 4', 5 and 5", diagrammatically illustrated in Fig. 1, correspond in themechanical structure to those indicated at 1', 2', a, 4", 51 and 5*, in Fig-10, and the contact 5" is utilized in conjunction with the contact 5 in the receiving trans- .lator (Fig. 10), but in the transmitting translator the contact 5 may be omitted or not used, and cam shaft 21 having the short "is provided for causing a final operation of recording or printing mechanism at the receiving station B- p Referring to Fig. 1, the main line 50 is connected with the normally open contacts of the series of contacts 6', 1, 2', 3, 4, 5' at thetransmittini' station A, and at the receiving station a relay 51 is provided on the main 'line and connected .by-wire 52 to The normally retracted armature 51 of relay 51 at the receiving station is adapted to engage a contact 54, upon the closing of the line contacts at the transmitting station, to thereby close a circuit through the resistance 59 and thence by conductor 55 to the armature 49" of relay 49', the circuit leading thence to the normally closed contact 3 magnet 22', and variable impedance 60 to ground 68, and also from 56 to ground 57 through resistance 63. Variable impedance 60 is used to vary the Speed of operation of magnet 22. 'When a key is depressed and contact 6 is closed at the transmitting station, magnet 22 at said station will be energized through a starting circuit from battery58, through contact 6, resistance 59, the normally closed contact 56 of relay 49, normally closed contact 32, spring 33, magnet and variable impedance 60 to ground 61, which parts are substantially similar to those at the receiving station. As soon as magnet, 22 operates, the pawl 24 will cause cam shaft 21 to advance a step and thereupon unison cam 31 will release tooth and permit contacts 47 and 48 at the transmitting station to close and the circuit of magnet will be broken at 32 by the depression of contact lever 37, whereupon latch 40 will retain lever 37 down and circuit will remain broken at 32 until nearly the completion of the upstroke of arm 23, whereupon its stud 42 causes latch 40 to release lever or arm 37 and topermit contact 32 to again close, whereupon the same operations of the magnet are continued until the cam shaft has made nearly a complete revolution to a pointwhere the unison cam 31 causes the working circuit to be broken at 48 upon the last upward movement of arm 23. Each upward movement of arm 23 also advanws the cam shaft by means of pawl 25. As soon as contact 48 is closed at the transmitting station, current will flow through the working circuit from battery 58 and line 61 to, the righthand winding. of relay 49, through contacts 47 and 48, thence through contact 32, magnet 22, and impedance to ground 61.

As soon as current flows through the righthand winding ofrelay 49, its armature 49 is attracted, thereby breaking the normally closed circuit at 5 6 and closing the circuit at contact 62 and current will flow from battery 58 through Contact 6, resistance 59, armature 49, previously closed contact 62, lefthand winding of relay 49 to ground at 63, thereby reventing a re eated rotation of the cam s aft out of or er as long as contact 6 remains closed. Thus it will be seen that in order to cause another rotation of the cam shaft it will be necessary to break contact 6 and again close Relay 49 is operated as soon as contact is closed at 48 becanseof the difference of potential across resistance 59 when contact at 48 has been closed and contact 6 is retained closed. Duringv this time magnet Z retains the operated bars 7 and 7 in their set positions as long as; said magnet is energized, and at the termination of a complete rotathrough 33,

tion or cycle of the cam shaft and when unison cam 31 breaks contact at 47, 48, both magnets 22 and Z are denergized and the parts are restored to normal, except relay 49 which will remain in its operated position as long as contact 6 is retained closed, which might occur by retaining the key 8 depressed, although magnet Z has been deenergized. Variable impedance 60 is used to vary the speed of operation of magnet 22, and thereby the speed of rotation of the cam shaft, and by this means the variation of the length of the impulses on the line may be regulated as desired. A similar variation of the speed of rotation of the cam shaft of the receiving translator or translators may be effected by varying their corresponding impedance.

In the transmitting translator the starting contact 6 is connected permanently to battery 9 so that as soon as its cam shaft starts to rotate, an impulse will be transmitted on the line, which impulse will operate the relays on the line, shown at 51 and 51. As soon as relay 51 at the receiving station is energized, current will flow through .the magnet 22 of the receiving translator to start the operation of its cam shaft substantially with the operation of the cam shaft at the transmitting translator, and thereby the contacts 1, 2, 3', 4, 5 at the transmitting station and the contacts 1, 2-, 3, 4, 5, at the receiving station will operate isochronally, so that impulses sent on the line by the first named contacts will operate relay 51 which will transmit impulses through the second named contacts (at the receiving station) in accordance with the contacts 1, 2, 3, 4, 5, that may have been closed by the operation of one or more of the bars 7, 7, from a key 8 that wasdepressed.

Assume that the system is adapted to operate a telegraph typewriting mach-inc requiring the selection and operation of five magnets or relays, and that amagnet or relay 6 is used for printing and restoring purposes, utilizing magnets such as shown at 1", 2 3", 4, 5", 6", (Fig. 1), which magnets or relays are shown connected to ground at 61, and that it is desired to select a character represented by the o eration of magnets 2 and 4 at the receiving station. The depression of the appropriate key 8 will move the universal bar 7 to close contact 6 and two bars 7 to close contacts respectively at 2 and 4. The closing of contact at 6 will cause magnet 22 at the transmitting station to be energized, which will start the rotation of its cam shaft, and the contacts 6', 1, 2, 3', 4', 5, in that order, will be operated at the speed leterniined by the impedance 60. Current wi 1 flow to and over line 50 through contact 6', and through contacts 2 and 4' in the order of their closing. but no current will then How to line through the contacts 1, 3' and 5' notwithstanding that they will be closed during rotation of the cam shaft. The current flowing on the line, as stated, corresponding to the operation of contacts 6, 2 and 4, will cause operation of the relays 51 and 51, and when the latter is operated it will cause contact to be closed at 54 through its armature, which contact 54 corresponds electrically with the contact 6 of the transmitting keyboard. The closing of contact at 54 supplies current for a starting circuit from battery 58', through conductor (37, armature 51, contact 54, resistance 59, conductor 55, armature 49 normally closed contact 56 of relay 49', normally closed contact 32, spring 33', magnet 22, impedance 60 to ground 68, thereby energizing magnet 22', causing the rotation of its cam shaft and the advancing of its unison cam 31 to permit closing contact at 48 and breaking contact at 32, with the same effect of the operation of arm or lever 37' as previously described with respecttothe arm or lever 37 at the transmitting translator. As soon as contact is closed at 48 current will flow through a working circuit from battery 58' through righthand winding of relay 49, contact 48, magnet 22, impedance 60 to ground 68, when contact at 32' is closed, and also from contact 56, resistance 63 to ground at 57. When current flows through righthand winding of relay 49' it will at: tract its armature 49" and break contact 56 and close contact 62, so that as long as the contact is closed at 48 relay 49 will be energized by current flowing from battery.

58', righthand winding of relay 49, contact 48, magnet 22, impedance 60, to ground 68, or directly through resistance 63' to ground 57. Relay 49' will be energized through the lefthand winding as long as contact 54 is closed through the circuit from battery 58, 67, armature 51?, contact 54, resistance| 59, lead'55, armature 49 previously closed contact 62, lefthand winding of relay 49 through resistance 64' to ground at 63: The operation of magnet 22 causes intermittent rotation of its cam shaft 21, thereby operating the contacts 1, 2 3, 4*, 5 successively at a speed determined by the impedance 60. (5 also being operated) substantially isochronally with the rotation of cam shaft 21 of the transmitting station.

Magnet 22 at the transmitting station will make three complete steps for the space of each cam, the lengths of which cams are shown diagrammatically in Fig. 6, and while the cams at the receiving station or stations may be of any desired length compared to the cams at the transmitting station, I have, in the example illustrated, provided the cams at the receiving translator one-third the length of those at the transniitting translator, and so disposed with respect to the latter that the cams at the receiving translator operate contacts 1, 2, 3, 4, 5, at.a point or interval approximately corresponding to the second step of the corresponding cam at the transmitting translator while the last named cam holds its contact closed at 1, 2, 3, 4' or 5' respectively, whereby the magnet 22 will operate three times per cam face utilized or per contact closed, but the receiving translator will retain the respective levers operated for the. interval corresponding to one cycle of ma I et 22 so that signals from the transmitting station will be three units long, whereascontacts 1, 2, 3 4, 5 at the re ceiving station will be retained closed for a time equal to one such unit in duration, and intermediate the extremes of such three units. The cam face at the receiving station that would correspond to the cam face 21 that operates the contact 6 at the transmitting station, is eliminated. It will be understood that the cam face 21 at the transmitting station corresponds with the cam face 21 at the receiving station; the cam face 21 at the transmitting station corresponds with the cam face 21 at the receiving station, and so on. The cam faces at the receiving station will be operating during approximately the center unit of the three time units of the corresponding cam faces at the transmitting station, and if the line relay 51 is energized during the time the contacts 1, 2", 3, 4, 5 are operated then current will flow from battery 58' at the receiving station throilgh the contact 54, resistance 59, and resistance and the particular closed contact in the receiving group 1, 2, 3, 4, or 5, corresponding to the closed contact.l, 2, 3, 4, 5, in.the transmitting group or station to its respective magnet or relay 1", 2", 3*, 4, 5, it being recollected that relay 51 is receiving current only by reason of the closing of contacts 1', 2, 3', 4', 5 successively, and then only when the corresponding contact 1, 2, 3, 4, 5, has been closed. While I have, for purposes of illustration, referred to the cam shafts as being operated by three steps or operations per cam face or time unit utilized, it will be understood that such number of steps or operations may be varied in all or any of the translators, it being desirable, though, to keep the duration of closure of the receiving contacts small in proportion to that of the transmitting contacts. It also will be understood that for the purpose of attaining high speed of operation, a single cycle of operation of the magnet at the transmitting translator may be utilized per signal transmitted, and that the corresponding contacts of the receiving translator may be closed for a fraction of a cycle of operation of its magnet 22'. Also, that the moment of closing the contacts at the receiving translator may be varied with respect to the signals from the transmitting translator, by the-introduction of an impedance or resistance, such as at 59, in the starting circuit of the receiving translator, for the purpose of causing the closing of the contacts of the receiving translator at a desired point intermediate the extremes of line signals.

It will be understood in the example set forth, that the magnet or relay 6" is energized at or near the termination of each complete rotation or cycle of the cam shaft at the receiving translator by reason of the operation of the contact 5 (Fig. 10), whether or not current has been transmitted through the contact 5', for the purpose of completing the operation effected by reason of the operation or non-operation of one or more of the magnets or relays 1", 2, 4,

at the receiving station- It will be understood that the teeth of wheel 26 may be proportioned in number, with respect to the number of cam faces upon the corresponding cam shaft, so that in the example illustrated three steps ofsaid wheel (or the space of three teeth) will be utilized with one cam passage under the correspondin arm 18, and that during such three steps t e corresponding cam face atthe transmitting translator will keep con tact closed at 1, 2', 3', 4, 5', while at the receiving translator the cam faces of its cam shaft will only close contact at 1', 2, 3, 4, 5 momentarily and between the extremes of movement of the corresponding cam faces at the transmitting translator, whereby the cam shafts of the transmitting and receiving translators operate substan= tially isochronally, the relatively short closing of the contacts 1, 2, 3, 4, 5, permitting a relatively variable time for the operation thereof with respect to the time during which the cam faces at the transmit-.

ting translator are keepin the circuit closed at 1, 2, 3', 4', 5. y this means such time intervals at the receiving translator permit of slight variation from absolute isochronism between the transmitting and receivin translator cam shafts, with,- out danger o mistakes occurring in receiv ing of the desired signals or impulses, and any variations that might occur with respect to the time intervals of the transmitting and receiving translators will be corrected each time that a series or group of impulses is transmitted on the line by reason of the fact that when the cam shaft at the transmitting translator has made one complete rotation and the corresponding unison cam 31 again operates the spring 46 to break circuit at 47, 48, the circuit of the corresponding magnet 22 is definitely broken, and such magnet will not operate again until another or repeated series or group of impulses is sent on the line. However, for each complete series of steps of the transmitnorma-l startin ting cam shaft, the transmitting magnet 22 is operated for one com lete rotation of the corresponding cam sha but the effect of transmitting desired groups of impulses to the receiving translator for the purpose of operating the magnets or relays 1, 2", 3" 4 5", is effective only in accordance with the contacts 1, 2, 3, 4, 5, which have-been closed upon the depression of a given key 8.

Should the relay 51, for any reason he re tained energized after the cam shaft of the receiving translator has made a complete rotation, said cam shaft will be prevented from another rotation out of order by means of relay 49 being held energized by the circuit from battery 58', conductor 67, contact 54, resistance 59, wire 55, armature 49, contact 62', and lefthand winding of relay 4'9, and resistance 64 to ground 63, causing the circuit from contact 54 to magnet 22', which has been previously opened by the breaking of contact 56) to be maintained broken, and magnet :22 can- 'sponding to such key will be repeated continuously by the transmitting mechanism, and received continuously by the receiving mechanism, inasmuch as the relays 49 and 49' are not then retained energized, so that the magnets 22 and 22' may then operate continuously, enabling determination of the relative speeds of the two translators with respect to one another, since any error will be cumulative, and indicating desired readjustment of the impedance coils 60 or 60' at the difierent stations to bring the translators into closers-accord.

While I haveil'lustrated and described a transmitting translator at one station and a receiving translator at another station, it will be understood that for the purpose of making'a home record at the transmitting station, that will correspond to the record 12 made at the receiving station or stations, there may be included in the line. a transu'iitting and receiving translator at each station. To this end the relay 51 is shown connected in the main line at the transmitting station A, and its local contacts'mav control apparatus iden tical with that illustrated in station B by connecting the lead from contact 54 to the receiving translator in the manner shown at the station B. For the purpose of 18! transmitting from any station switches 72, 72' are provided to connect the transmitting translator to the line or to shunt it out. It will be understood, further, that any desired number of transmitting and receiving translators may be included in the main line at and between distant points, and that any number of receiving translators may be included in a line to record from any particular transmitting translator on the line, whether or not a transmitting translator is included on the line at each station. If a transmitting translator, a keyboard, and corresponding parts, are to be included in the line at station B, they may be connected by conductor 73 leading to contacts similar to contacts 6, 1, 2, 3', l, 5, as illustrated at station A. 1

Having now described my invention what I claim is 1. An electric controlling system compris. ing a line, a plurality of contacts at stations on the line, circuits for said contacts, means to operate corresponding contacts substantially isochronally at said stations, means to selectively close the circuits ofsaid contacts at one of said stations, local circuits at said stations for controlling the operation of said contacts thereat, means at one-of said stations for closing its said local circuit to start the operation of its contacts, means at another station for closing the local circuit thereat to start the operation of its contacts substantially with starting the operation of the contacts at the first named station, other local circuits at-said stations, and means at the second named station to shift the operating means of saidcontacts thereat to another local circuit.

2. An electric controlling system comprising a line, a plurality of contacts at stations on the line, circuits for said contacts-means to operatecorresponding contacts substantially isocltironally at said stations. means to selectively close the circuits of said contacts at one of said stations. local circuits at said stations for controlling the operation of the first named contacts thereat, means at one of said stations for closing its said local circuit to start the operation of its contacts, means at another station for closing the local circuit thereat to start the operation of its contacts substantially with starting the operation of the contacts at the first named station, other local circuits at said station, means at the second named station to shift the operating means of said contacts thereat to another local circuit, and means to break said local circuits at the termination ofa cycle of operations of the first named contacts.

3. An electric controlling system comprising a line, a plurality of contacts at stations on the line, circuits for said contacts, means to operate corresponding contacts at said thereat, means at one of said stations for nal is maintained on the line.

stations, means to selectively close the circuits of said contacts at one of said stations,

local circuits at said stations for controlling the operation of the first named contacts closing its said local circuit to start the operation 0t its contacts. means at another station fonclosing the local circuit thereat to start the operation of its contacts substantially with starting the operation of the contacts at the first named station, other local circuits at said stations. means at the second named station to shift the operating means of said contacts thereat to another local circuit, means to break said local circuits at the termination of a cycle of operations of the first named contacts, and means to retain said local circuits broken after the completion of said cycle of operations while a sig- 4. An electric controlling system comprising a line, a plurality of contacts at stations on the line, cgggcu ts for said contacts, means to operate corresponding contacts successively and substantially isochronally at said stations, means to selectively close the circuits of said contacts at one of said stations, local circuits at said stations for controlling the operation of the first named contacts thereat, means at one of said stations for closing its said local circuit to start the operation of its cont-acts, means at another station for closing the local circuitthereat to start the operation of its contacts substan tially with starting the operation of the con- 1 tacts at the first named station, other local circuits at said station, means at the second named station to shift the operating devices of said contacts thereat to another local circuit, and means to control the time of operation of said contacts.

5. An electric controlling system comprising a line, a plurality of timing contacts at stations on the line, one of said contacts at one of said stations being connected to a source of electrical energy. means to operate corresponding contacts successively at each station, local starting circuits at said stations having magnets respectively controlling said means, said starting circuits being normally open, a starting contactat the first named station in its local starting circuit for closing the latter, means at said station to close said contact and to select the required timing contacts at said stations for transmitting signals on the line, means on the line at the second named station to close its local starting circuit, local working circuits at said stations. means at said stations to shift said operating means from their local starting circuits to their local Working circuits, and means to break said local circuits upon the termination of the cycle of operations of said timing contacts and restore the local starting circuits to normal.

pulses on the line ofa' predetermined duration, the receiving translator having means controlled by said impulses on the line for transmitting impulses of less duration than said impulses on the line respectively in substantial isochronism with respect to said impulses on the line.

8. An electric controlling system comprising a line, a, transmitting translator and a receiving translator associated with said line, the transmitting translator having a plurality of contacts for transmitting a plurality of impulses on the line of a predetermined duration, the receiving translator having a plurality of contacts corresponding to said cont-acts of the transmitting trans,-

lator, means to actuate saidcontacts of saidtranslators, and means controlled by said,

impulses on the line for operating the contacts of the receiving translator to transmit impulses of shorter duration than the impulses on the line, the corresponding contacts of said translators operating in substantial isochronism. v

9. An electric controlling system comprising a line, a transmitting translator and a receiving translator associated with said line, the transmitting translator having a plurality of contacts for transmitting -:a plurality of signalson the line of a predetermined duration, the receiving translator having a plurality of contacts corresponding to said contacts of the transmitting translator, means to actuate said contacts of said translators, and means controlled by said signals on the line for operating the contacts of the receiving translator to transmit.

signals between the ezitremes of the corresponding signals on the line.

10. An electric controlling system comrising a line, a transmitting translator and a receiving translator associated with said line, the transmitting translator having a plurality of contacts for transmitting a plurality ofsignals, on the line, said signals havin a duration of a plurality of time units,

said transmitting translator having means to actuate its contacts, the receiving trans: lator having a plurality of contacts corresponding to saidcontaets of the transmitting translator, and means controlled by said signals on the line for operating the contacts of the, receiving translator corresponding to said signals on the line but of less number of time units than the latter.

11. An electric controlling system comprising a line, a transmit-ting translator and a receiving translator associated with said line, the transmitting translator having a plurality. of ,contacts, intermittently operating devices for closing the contacts of the transmitting translator successively and holding them closed during predetermined units of time, the receiving translator having intermittently operating.-devices for closing the corresponding'contacts of said translator during tn'neumts of less duration than those of the corresponding contacts of the transmitting translator, and means controlled by signals on the line to .cause operation of said intermittently operating devices in the receiving translator.

12. An electric controlling system comprising a line, a transmitting translator and a receiving translator associated with said line, the transmitting translator having a plurality of contacts, intermittently operating devices for closing the contacts of the transmitting translator successively and holding them closed during predetermined units of time, the receiving translator havingintermittently operating devices for closing the corresponding contacts of said translator during time units of less duration than those of the corresponding contacts of the transmitting translator, and means controlled by signals on the line to cause operation of saidintermittently operating'devices in the receiving translator, the closing of the contacts inv the receiving translator being intermediate the extremes of the time units of the signals on the line.

13. A plurality of contacts, electrically operating means to close and open said contacts, a starting circuit for said means, a working circuit for said means, means to control said starting circuit, means to shift said first named means from the startin ,circuit to its working circuit after sai ing circuit and a working circuit for said electrically operating means, and means to control said circuits.

15. A translator of the class described said means to cause each cam to have a plu-y rality of independent movements for each contact.

17. An electric controlling system comprising a transmitting translator, a receiving translator, said translators having similar means for transmitting signals, a line between said translators, circuits controlled by the receiving translator, normally inactive prime movers for each translator adapted when actuated to operate its said transmitting means, means to start the operation of the transmitting translator to in turn cause the starting of the receiving translator, and means to vary the time of starting of the receiving translator.

18. An electric controlling system comprising a line, a plurality of contacts at each of a plurality of stations on the line, rotatable cams at each station for operating its said contacts, normally inactive electromagnetic means for rotating all of said cams in substantial isochronism, and a variable inductance connected to each of said electromagnetic means for varying the speed of the cams rotated thcreb Signed at New Y hrk city, in the county of New York and State of New York, this- 3rd day of geptember, A. D., 1914.

ALLEN D. CARDWELL.

Witnexes:

MARIE F. WAINRIGHT, SYLVIA SCHNAPS. 

